Elevator.



Patented Sept. 4, I900;

No. 657,380. C. W.&. W. D. BALDWIN.

M. E. BALDWIN, Executrix of 0. W. BALDWIN, Dacd. ELEVATOR. (Application filed Feb. 4, 1898.) J (NuModeL) 2 Sheets-Shaw: M I 1 W o I I I/Vanessa) W wwmm.

. Patented ept. 4, 1900. C. W. &. W. D. BALDWIN. V M. E. BALDWIN Executrix of C. W. BALDWIN, Dec'd.

ELEVATOR.- v (Application filed Feb. fl, 1898.) (No Model.)

2 Sheets-Sheet 2.

witmeaavzo 1' NORRXS PETERS coy PHOTO-U040 WASHINGTON, a, c

' UNITED STATES PATENT OFFICE.

oYRUs W. 'BALDWINAND WILLIAM DELAvAN BALDWIN, or YONKERS, NEW YORK, MARY E. BALDWIN EXEGUTRIX or sAID cYRUs W. BALDWIN,

DECEASED, ASSIGNORS TO ORANGE, NEW JERSEY.

THE OTIS ELEVATOR COMPANY, OF EAST ELEVATOR.

SPECIFICATION forming part of Letters Rete t N 657,380, dated September 4, 1900. Application filed February 4. 189$. Serial No. 669.073. (No model.)

To all whom, it may concern: r Be it known that We, CYRUS W. BALDWIN and WILLIAM DELAVAN BALD WIN, citizens of Q the United States, residing at Yonkers, ini

5 the county of Westchester and State of New 3 York, have invented certain new and useful 1 Improvements in Elevators, of which the following is a specification. 1 This invention relates to that class of ele I vators in which the cage is suspended by flexible connections; and our invention consists of novel means fully set forth and 1 claimed hereinafter, whereby the cage may be propelled positively in either direction and in I 5 certain improved details of construction, as j Figure 1 is an elevation of sufficient of an elevator to illustrate the improvement. Fig. 2 is a side elevation in part section. Fig. 3

is an enlarged sectional view of part of the apparatus.

The cage X travels between guides F F- within the Well, as usual, and one or more suspension cables 1" pass over the upper guide-sheave L and downward to a counterweight O, which in the present instance preferably exceeds the Weight of the cage to a greater or less extent. At the opposite end 0 of the well are arranged the driving-sheaves, of which there may be one or more, a series L of such sheaves being shown mounted upon a shaft 36, connected to be driven by a suitable motor M and constituting practically a grooved drum, the shaft 36 having its bearings in the stationary portion 30 of a frame N, the upper portion 31 of the said frame being movable and having sockets to receive rods 32, projecting from the lower part 30 of 0 the frame, with springs 33- inte'rposed between the two portions of the frame. The upper portion 31 of the frame carries a transverse shaft or axle 35, on which turn freely a series of counter-sheaves L, and a cable 4" passes from the bottom of the cage around the lower part of the sheaves or drum L in one of the grooves of the same upward and around one of the counter-sheaves L and down and around or in one of the grooves of the sheave L, and thence upward to the lower part ofthe counterweight 0. By this means an extended frictional bearing for each cable is secured, preventing any possible slippage when the driving sheaves or drums are either in motion or stationary.

In order to prevent contact of the driving 1 cables 0' with the upper sheave, two separated guiding-drums 45 46, mounted upon suitable bearings within the well, or two series of sheaves arranged side by side, serve to separate the different portions of the cables 0", as best shown in Fig. 2.

In order to provide for expansion and 0011- traction of the cables and maintain the same taut at all times, we connect each cable to an eyebolt 38',whic'h passes through a bracket 40 upon the lower part of the cage and is provided with a nut 41, bearing upon a spring 39, the nut serving to impart the desired degree of tautness to each cable in the first instance and the spring yielding under the contraction of the cables and expanding to maintain them taut when the cables are relaxed. A like arrangement may be upon the counterweight O, as shown, or the arrangement may be only upon the counterweightor only upon the cage.

By interposing a spring-bearingbetween the two separate parts of the frame N, carrying the driving-sheaves and counter-sheaves, we are enabled to take up shocks and vibrations resulting from irregularities in the movements of the driving mechanism, compensate for any expansion or contraction of the cables between the two sets of sheaves, and secure a better frictional adhesion of the cables to the driving-sheaves.

The driving-sheaves may be driven in any suitable manner. As shown, there is an electric motor M, and there is a control device P within the cage, by means of which the movements of the motor may be controlled as required.

Instead of making the two sets of cables 1" r of the same size we make thedriving-cables r, which have to convey motion, but do not support the weight of the cage, much smaller than the suspension-cables r, so that they are more flexible, and this permits us to use smaller driving. and counter sheaves. V.

By driving the cage by means of cables passing around, but not wound upon, the driv ing drum or sheave, connecting both ends'of the cables directly or indirectly with the cage, we are enabled to use a drum of compara tively-small size and secure a direct opera-. tion uponthe cage and drive it positi'velyin both directions by means of light cables, the counterbalance in some instances lifting the cage without the exercise of any direct propelling force on the part of the motorand the load in the cage in other instances driving it downward without assistance from the motor. It is also possible in the arrangement shown to connect the motor directly to the shaft of-the driving-sheaves, thereby dispensing with aworm and gear, this resulting from the fact that the passage of the cable around the two series of sheaves is sufficient to retard .the movements of the cables and prevent any the cage will ascend under the action of the counterweight the motor in such case is driven by the movement of the cage, causing a counter electromotive force, which serves as a a brake tothe too-rapid upward movement of the car, and in like manner when. the car is descending under its load and drives the mo.-

ton there isla. "similar: counter electron'aotive force which. acts as a -..brake to prevent toorapid downwardniovement. Without limiting ourselves to the precise construction and arrangement of parts shown, ,we claim.as.our. invention I t 1. The combination with acar, its counterweight, and upper and lower sheave gof flexible connections passing from the topand bottom of the car to thecounterweight, a frame in two sections, a set of sheaves supported "by each section, the lower flexible connections passing around both of the sets of sheaves car- ,ried by, said frame, springs between the sections, a motor connectedto drive the lower isheaves of-the frame, and means forcontrolling the motor-from the car, substantially as set forth. l

2. The. combination'with the car, of driving-cables,- two sets of sheaves around which the cable passes and means for separating them under: yielding tension, .eyebolts connected withsaid cables and passing through apart of the car and provided with nuts, and springs interposed betweenthe nuts andbearing on thecar, substantially as set forth.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

CYRUS 'W. BALDWIN. v V 7 WILLIAM DELAVAN BALDWIN.

Witnesses: x

FREDERICK E. HUBBELL,

ABRAM E. SCHULTZ. 

